Analysis On Construction Process Of Long Span Steel Concrete Composite Beam Cable-Stayed Bridge

With the rapid development of society and economy,the links between different regions become more and more close,and the number of long-span cable-stayed bridges,such as cross sea,cross river and cross gorge,is increasing.With the increase of span and width of bridge,it is more difficult to ensure the safety of structure.In order to better understand the stress and stability behavior of cable-stayed bridge during construction stage,this paper takes Ganjiang Second Bridge of Zhangshu City,Jiangxi Province as the engineering background,relying on the platform of ANSYS finite element software,the construction process of the composite beam cable-stayed bridge is analyzed.The main contents and main conclusions are as follows:The present situation and development trend of cable-stayed bridges at home and abroad are summarized.The structural characteristics of cable-stayed bridges and the mechanical characteristics of various components during construction are also discussed.The geometric nonlinear factors involved in the analysis of cable-stayed bridge construction process and the realization methods in ANSYS software are introduced in detail.The method of establishing the finite element model of the cable-stayed bridge is described,including the selection of the unit type,the simplified method of the model,the method of applying the cable force and the load,and the connection way between the components.Ganjiang Second Bridge finite element model was built by the APDL parameterized command program,and the correctness of the model is determined by comparing the cable force with the cable force provided by the design unit.According to the actual construction sequence of cable-stayed bridge,the finite element analysis is carried out.The analysis results of geometric nonlinear factors in typical section are listed in detail and the influence degree of geometric nonlinear factors is analyzed.Considering the transition from the maximum cantilever state to the bridge state,the influence of the structural system transformation on the results is analyzed.The linear buckling analysis and geometric nonlinear buckling analysis of typical sections of cable-stayed bridges during construction are carried out,and the stability coefficients and buckling modes of typical sections are obtained.Through the analysis of stability coefficients and buckling modes,the stability of the overall structure of the construction process can be obtained.The research results provide a reference for engineering practice and similar engineering construction.